Model error diagnosis

OpenAI: GPT-5.3-Codex | model permission denied

OpenAI: GPT-5.3-Codex returning 403 / model permission denied means you should first confirm whether model ID openai/gpt-5.3-codex is visible for this OpenAI key, then separate permission, context, capability, rate limit, or route issues.

Model

openai/gpt-5.3-codex

OpenAI: GPT-5.3-Codex

Provider

OpenAI

62 models in catalog

Error type

model permission denied

permission-denied

Status code

403

global model route

Model error summary

Model

openai/gpt-5.3-codex

Error type

permission-denied

Status code

403

Read-only check. Detection data burns after 5 minutes.

What this model error usually means

OpenAI: GPT-5.3-Codex returning 403 / model permission denied means you should first confirm whether model ID openai/gpt-5.3-codex is visible for this OpenAI key, then separate permission, context, capability, rate limit, or route issues.

Model: openai/gpt-5.3-codex
Provider: OpenAI
Status code: 403

How to prove it during checking

Read-only check. Detection data burns after 5 minutes.

List models: confirm whether openai/gpt-5.3-codex is actually visible instead of guessing from the display name.
Light probe: use minimal input to verify whether OpenAI returns the same 403, then record the error body.
Compare model facts: context 400,000, input $1.75, output $14.
supports include_reasoning
supports max_completion_tokens
supports max_tokens
supports reasoning

Next action

OpenAI: GPT-5.3-Codex model permission denied should not end at failed. Return the next move: change model ID, add permission, reduce context, disable unsupported capability, change route, monitor, or hold listing.

Context: 400,000
Price: $1.75 / $14
Read-only check. Detection data burns after 5 minutes.

Open key checker

Read-only check. Detection data burns after 5 minutes.

Open models

OpenAI: GPT-5.3-Codex

Open providers

OpenAI